Hi Akash (Good Evening),
The Six Sigma methodology is outstanding in reducing a product and/or services variation and defects so that the quality levels meet customer requirements. So while a great methodology to increase effectiveness, some of its challenges include not having as many tools and techniques to address inefficiencies. The Lean methods did a better job to address speed, flow, just-in-time inventory management, etc…
Therefore Lean Six Sigma has evolved as a more complete methodology and toolset for many practitioners. There are also many additional approaches that also produce outstanding results, which are often integrated into Lean Six Sigma, such as TRIZ, ITIL, PMI, SCOR, and CAP, to name a few.
All these various business management changing methodologies exist to address certain segments that while Six Sigma has proven successful, it was less complete.
i.e. SCOR (Supply Chain Operations Reference) is the main standard for supply chain management but is even more powerful when integrated with Lean Six Sigma methods! Or ITIL (Information Technology Infrastructure Library) is the best practice in IT Service Management Practices, including call centers, onsite support, procurement, networking, asset management, etc… Its so much more effective with the data rich and efficiencies delivered via Lean Six Sigma designs.
My 2-cents,
Warm Regards
Steven Bonacorsi
Lean Six Sigma Master Black Belt
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